Round ball hat



FIG. 1 is a front perspective view of a round ball hat showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof the opposite side is a mirror image; and,

FIG. 5 is a top plan view. 

The ornamental design for a round ball hat, as shown and described. 